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Password Strength Checker

Estimate how long a password would take to crack, and see exactly what weakens it.

To check password strength, type it above and the tool estimates entropy from length and character variety, then converts that into an offline crack time. Analysis runs entirely in your browser and the password is never transmitted, logged or stored.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Is it safe to type my real password here?

The analysis is pure client-side JavaScript with no network request, so nothing is sent anywhere. Even so, the safest habit is to test a password of the same shape rather than the exact one you use.

How to use the password strength checker

  1. 1Enter or paste your password.
  2. 2The result appears immediately — copy or download it.

Embed this tool

Put the working password strength checker on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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